|
ИСТИНА |
Войти в систему Регистрация |
ИСТИНА ЦЭМИ РАН |
||
Can Superflares Occur on the Sun? A View from Dynamo Theoryтезисы доклада Тезисы
- Авторы: Katsova M., Kitchatinov L., Livshits M., Moss D., Sokoloff D., Usoskin I.
- Сборник: Tenth Workshop "Solar influences on the magnetosphere, ionosphere and atmosphere" Primorsko, Bulgaria, June 4-8, 2018, Book of Abstract
- Тезисы
- Год издания: 2018
- Место издания: Space Research and Technology Institute Bulgaria
- Первая страница: 5
- Последняя страница: 6
- DOI: 10.31401/WSoz.2018.abs
- Аннотация: The Kepler mission has revealed the occurrence of superflares in sun-like stars which exceed by far any observed solar flares in release of energy. Radionuclides data do not provide evidences for occurrence of superflares on the Sun over the past eleven millennia. A natural idea is that the dynamo mechanism in superflaring stars differs in some respect from that in the Sun. We search for a difference in the dynamo-related parameters between superflaring stars and the Sun to suggest a dynamo-mechanism as close as possible to the conventional solar/stellar dynamo but capable of providing much higher magnetic energy. Dynamo based on joint action of differential rotation and mirror asymmetric motions can in principle result in excitation of two types of magnetic fields. First of all, it is well- known in solar physics dynamo waves. The point is that another magnetic configuration with initial growth and further stabilisation is also possible for excitation. For comparable conditions, magnetic field strength of second configuration is much larger rather of the first one just because dynamo do not spend its efforts for periodic magnetic field inversions but use its for magnetic field growth. We analysed available Kepler mission data concerning the superflaring stars in order to find tracers of anomalous magnetic activity. We find that anti-solar differential rotation or anti-solar sign of the mirror-asymmetry of stellar convection can provide the desired strong magnetic field in dynamo models. We confirm this concept by numerical models of stellar dynamos with corresponding governing parameters.
- Добавил в систему: Кацова Мария Михайловна